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==Human mitochondrial single-stranded DNA binding protein, SSBP1, at 2.1 A resolution - elucidated sequence==
<StructureSection load='6rup' size='340' side='right'caption='[[6rup]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6rup]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6RUP OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6RUP FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=6rup FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6rup OCA], [https://pdbe.org/6rup PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6rup RCSB], [https://www.ebi.ac.uk/pdbsum/6rup PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6rup ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/SSBP_HUMAN SSBP_HUMAN] This protein binds preferentially and cooperatively to ss-DNA. Probably involved in mitochondrial DNA replication. Associates with mitochondrial DNA.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Mutations in genes encoding components of the mitochondrial DNA (mtDNA) replication machinery cause mtDNA depletion syndromes (MDS), which associate ocular features with severe neurological syndromes. Here, we identified heterozygous missense mutations in SSBP1 in five unrelated families, leading to the R38Q and R107Q amino-acid changes in the mitochondrial single-stranded DNA-binding protein, a crucial protein involved in mtDNA replication. All affected individuals presented optic atrophy, associated with foveopathy in half of the cases. To uncover the structural features underlying SSBP1 mutations, we determined a new revised SSBP1 crystal structure. Structural analysis suggests that both mutations affect dimer interactions and presumably distort the DNA binding region. Using patient fibroblasts, we validated that the R38Q variant destabilizes SSBP1 dimer/tetramer formation, affects mtDNA replication and induces mtDNA depletion. Our study, showing that mutations in SSBP1 cause a novel form of dominant optic atrophy frequently accompanied with foveopathy, brings new insights into mtDNA maintenance disorders.

Dominant mutations in mtDNA maintenance gene SSBP1 cause optic atrophy and foveopathy.,Piro-Megy C, Sarzi E, Tarres-Sole A, Pequignot M, Hensen F, Quiles M, Manes G, Chakraborty A, Senechal A, Bocquet B, Cazevieille C, Roubertie A, Muller A, Charif M, Goudenege D, Lenaers G, Wilhelm H, Kellner U, Weisschuh N, Wissinger B, Zanlonghi X, Hamel C, Spelbrink JN, Sola M, Delettre C J Clin Invest. 2019 Sep 24. pii: 128513. doi: 10.1172/JCI128513. PMID:31550237<ref>PMID:31550237</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6rup" style="background-color:#fffaf0;"></div>

==See Also==
*[[Single-stranded DNA-binding protein 3D structures|Single-stranded DNA-binding protein 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Chakraborty A]]
[[Category: Delettre C]]
[[Category: Sola M]]
[[Category: Spelbrink HN]]
[[Category: Tarres-Sole A]]